Aluminium alloy



Patented Aug. 24,1937

ALUMINIUM ALLOY Yonosuke Matuenaga, Naka-ku, Yokohama, Japan Noimwing.Application May a, 1936, Serial No. 78,722. In Japan May 13, 1935 V 1Claim. This invention relates to an aluminium alloy consisting 2 to 5%magnesium, 6 to 14% zinc,

' 02 to 2.5% copper, 0.1 to 2.0% nickel, 0.01 to 1.5% iron, 0.1 to 1.0%silicon and the remainder 5 aluminium. .The new alloy may also contain atrace to 1.5% manganese, a trace to 0.5% titanium; a trace to 1.0%lithium. The object of the invention is to obtain an aluminium alloywhich has a very great tensile strength especially when subjected underheat treatment.

The new alloy may also'contain a small quantity of cobalt, molybdenum,vanadium, tungsten or beryllium without appreciable change of thenatures.

15 Example of the alloy showing percentages of the elements .employedand also tensile strength -and elongation when the alloys are subjectedunder a mode of tempering and annealing are given as follows: j

Zn 9.0 Cu 1.0. Ni 1.0 Fe 0.2 81 0.6

A] Rest Tensile strength kgJcm. -...L 57 Elongation 11 so As will beseen from the above example, the new hardly obtainable in knownaluminium'alloy.

As to mutual actions of the elementsfor the new alloy, it is supposed asfollows. A part of as magnesium may combine with silicon to form alloyhas a very great tensile strength which is magnesium silicide, andanother part of magnesium may be alloyed with a part of zinc and a partof aluminium to form various three elemental alloys of differentpercentage. Further copper and nickel may be alloyed with iron. 5 Thesechemical compounds and. alloys may crystallize out in the main element,viz., aluminium and may be uniformly distributed therein. Further, whenmanganese is employed, this manganese and titanium not only act asreducing agents, 10 but also hinders the growth of particles ofzincmanganese-aluminium alloys and also of coppernickel-iron alloy 'sothat the distribution of the alloy may be promoted. Also, as shown inthe example, the smaller per- 15 centage of iron gives a greaterhardness. This fact is supposed to be that. alloys of iron and otherelements may be of smaller hardness as compared with the alloyscontaining no iron so that an alloy having smaller percentages of lessso hardness may have a greater Also,

it is supposed that iron hasa tendency of decreasing the tensile engthand elongation -while this drawback is eli nated by using silicon orsilicon and manganese in a greater percentage. 25

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed I declare thatwhat I claim is:-.

An aluminium alloy consisting of 2 to 5% msgnesium, 6 to 14% zinc, 0.2to 2.5% copper. 0.1 to 2.0% nickel, 0.01 to 1.5% iron, 0.1to 1.0%silicon and the remainder aluminium.

YONOSUKE MA'I'UENAGA.

